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tab30 20th August 2003 10:22 PM

Rotel RB-990BX Supply Voltage
2 Attachment(s)
Hello, I would like to buid this amp for my subwoofer.
I have The PCB and I think I can trust this amp.

anybody knows the Supply Voltage of this Amp ?
The PowerCAP's ratet 80 V but... ??

And why did I found such few from this amp in the forum.
For me it looks great.

The Driver Transitor's ( 2SA 1492 and 2SC3856 ) are verry expensive exist some ceaper I can use.

What do You mean ?


Konrad 21st August 2003 09:00 AM

Hi, in the upper right corner of ure pic, i think i t says 81v , remember it as somthing near 80v from a previus modifikation.

tab30 22nd August 2003 12:15 AM

Not The Voltage
This means +B1 and on the neagitve rail -B3

ashok 22nd August 2003 05:16 AM

Full schematic
Hi Andi ,
Could you please post the full schematic. I can see only a strip of it.

I am sure you can use other power devices.
An 80 volt cap means that the supply must be at least 20% lower than this . Could be in the 60 + volt range.How many watts is it per channel ?
How about the full ckt diagram?

Warren M 22nd August 2003 03:09 PM

I found a schematic for the RB-991 power amplifier on the internet yesterday.
The RB-991 also uses 2SA1492 and 2SC3856 for the Driver Transitor's.

On the schematic for the RB-991 it says 73V.

If you would like to see the schematic for the RB-991 it can be found at

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